Hi, Thanks for the replies and let me elaborate a bit more on my problem. What I would like to have is a processor, which can operate at 1.8V and where I can use real-ice to edit/compile/download/debug, edit/compile,... Although there seem to be methods for the PIC18LF45K22 to erase flash at 1.8V ( ww1.microchip.com/downloads/en/DeviceDoc/41398B.pdf ) it looks like real-ice always uses bulk erase, which requires >2.7 V. It's fine for me to reset the configuration with > 2.7V, but I would like to develop my code with 1.8V. I would not mind switching the processor, even to something different from Microchip, but ideally I'm after a development method where I can operate the chip at 1.8V and can use edit/compile/download/debug without applying a higher voltage in between with real-ice. How are you usually developing when you have such constraints? Develop with a higher voltage and voltage translators to 1.8V and when everything works go reduce the voltage to 1.8V so the interface to the other board can be made without voltage translators? Regards, Robert ...."Real Time, adj.: Here and now, as opposed to fake time, which only occurs there and then." My public pgp key is available at: http://pgp.mit.edu:11371/pks/lookup?op=3Dget&search=3D0x90320BF1 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .